Your presence in the forums is a far heftier advertisement than a single "we've opened a store" email. One email and one alert compared to thousands and thousands of posts that advertise your business, which you do not have to pay for. Technically you bringing up your VIP program in this thread is a violation of the CUP but that was even allowed to stay.
It's really a simple matter if you look at it without emotion. Will your customer base grow, stay the same, or lessen over the years if you cease all posting here over the years? It's pretty clearly going to be lessen. Probably to a large degree.
We get advertising dollars for banner ads from lots of companies, including bass stores and companies. That doesn't stop Jason from Fodera or Dave from Genzler from posting in the forums as they know their presence means more potential customers and, what's most important, they like talking with the community. If you feel your business will be negatively affected, and have no wish to communicate with the forum if it doesn't benefit your business, then I guess there's nothing we can do.